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Table 2 Number of different counts across adherent days by sociodemographic and health characteristics among youth 6–17 years (n = 4028); NHANES 2003–2006

From: Performance of the ActiGraph accelerometer using a national population-based sample of youth and adults

  Sample size (n) Mean (SE) 25th percentile 50th percentile 75th percentile p value a
Gender:       <.0001
Male 2,026 1453.6 (8.0) 1184.0 1448.0 1701.0  
Female 2,002 1308.4 (7.2) 1075.0 1277.5 1534.0  
Age group:       <.0001
6 to 9 1,049 1621.5 (9.9) 1415.0 1632.0 1835.0  
10 to 14 1,804 1362.5 (7.5) 1130.0 1342.0 1579.0  
15 to 17 1,175 1196.1 (8.5) 992.0 1171.0 1385.0  
Race/ethnicity:       <.0001
Non-Hispanic White 1,019 1351.1 (11.1) 1078.0 1334.0 1621.0  
Non-Hispanic Black 1,352 1412.6 (9.9) 1150.0 1385.5 1647.5  
Hispanic 1,457 1369.7 (8.6) 1129.0 1354.0 1596.0  
Other 200 1410.1 (24.8) 1164.0 1393.0 1646.0  
Body mass index:       <.0001
Under weight (<5th percentile) 114 1394.7 (32.3) 1106.0 1355.0 1656.0  
Normal weight (5th- < 85th percentile) 2,426 1416.6 (7.3) 1152.0 1400.5 1666.0  
Overweight (85th- < 95th percentile) 680 1346.4 (12.8) 1099.0 1318.0 1585.5  
Obese (> = 95th percentile) 792 1303.4 (10.8) 1080.0 1279.0 1509.5  
Missing 16      
Moderate to vigorous leisure activity, self-reportedb:      <.0001
Tertile 1 (0–2.22 hours) 258 1102.8 (15.7) 928.0 1089.5 1261.0  
Tertile 2 (>2.22-9.68 hours) 255 1190.8 (17.8) 992.0 1171.0 1342.0  
Tertile 3 (>9.68 hours) 262 1250.8 (18.9) 1046.0 1230.5 1448.0  
Missing 3,253      
Number of adherent accelerometer days:      <.0001
3 days 337 979.8 (12.4) 815.0 968.0 1130.0  
4 days 466 1138.6 (11.4) 957.0 1129.0 1296.0  
5 days 702 1285.1 (10.8) 1077.0 1254.0 1475.0  
6 days 1,085 1443.8 (9.3) 1207.0 1430.0 1660.0  
7 days 1,438 1554.2 (8.5) 1323.0 1551.0 1775.0  
Weekends 4,028 424.0 (3.1) 306.0 442.0 562.5 n/a
Weekdays 4,028 957.4 (4.4) 759.5 944.0 1139.0 n/a
  1. n/a = not applicable; SE = standard error.
  2. ap value for comparison of the means; uses t-test for 2 level and analysis of variance for > =3 levels.
  3. bAsked only for those 12 years and older.